Update IR test for modern language and toolchain

ir-test/Makefile

@@ -3,11 +3,11 @@ PROG := ir-test
 
 all: clean $(PROG)
 
-$(PROG): $(PROG).bc
-	llvm-ld -o $@ -native $<
+$(PROG): $(PROG).o
+	gcc -o $@ $<
 
-%.bc: %.ll
-	llvm-as $<
+%.o: %.ll
+	clang -c -o $@ $<
 
 clean:
-	rm -f *~ *.bc $(PROG)
+	rm -f *~ *.o $(PROG)